basal bed

基本解释

There has strong water permeability at the basal bed of stilling basin for flood gate of Xixiayuan hydropower project.
西霞院泄洪闸消力池底部岩层具有较强的透水性，因此需在消力池底板下铺设排水管以降低扬压力。
Vertically, rocks near the unconformity appear layers which are in turn semi-weathering rock, weathering clay bed and basal conglomerate.
不整合附近的岩层在纵向上呈层分布：从下至上依次为半风化岩石、风化粘土层和底砾岩。
Objective To explore the problems which have occurred in the basal living nursing for severe in-bed patients, and then map out the countermeasures.
目的了解对卧床重症患者实施基础、生活护理存在的问题及改进措施。